Clockwise (seen from rear) = more rebound damping = slower extension.
Counterclockwise (seen from rear) = less rebound damping = quicker extension.
Fully clockwise you will find the defined zero position for maximum rebound damping. From this defined zero position you can go counterclockwise approx. 40 clicks for minimum rebound damping. Please note that there is no defined stop when you go fully counterclockwise, the adjuster will just stop clicking. The delivery setting should be in the 18-25 click range depending on model, counted counterclockwise from the defined zero position.